:root {
    --navbar-height: 80px;
    --primary-color: #125F9A;
    --primary-hover: #1b84d4;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --accent-color: aqua;
    --transition-speed: 0.3s;
  }
  
  html {
    position: relative;
    min-height: 100vh;
    scroll-behavior: smooth;
  }
  
  body {
    padding-bottom: var(--navbar-height);
    margin: 0;
  }
  
  .main-nav {
    position: relative;
    padding: 0.5rem 1rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 500;
    color: var(--text-color);
  }
  
  /* Efecto principal */
  .main-nav::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--primary-color);
    transform: scaleY(0);
    transform-origin: bottom;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }
  
  /* Efecto de fondo */
  .main-nav::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
      120deg,
      transparent 0%,
      rgba(18, 95, 154, 0.05) 100%
    );
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
  }
  
  /* Estados hover */
  .main-nav:hover {
    color: var(--primary-color);
  }
  
  .main-nav:hover::before {
    transform: scaleY(1);
  }
  
  .main-nav:hover::after {
    opacity: 1;
  }
  
  /* Estado activo */
  .main-nav.active {
    color: var(--primary-color);
    font-weight: 600;
  }
  
  .main-nav.active::before {
    transform: scaleY(1);
    background: var(--primary-color);
  }
  
  .main-nav.active::after {
    opacity: 1;
  }
  
  /* Animación en hover */
  .main-nav:hover {
    transform: translateY(-1px);
  }
  
  .main-nav:active {
    transform: translateY(0);
  }
  
  /* Footer */
  footer {
    position: absolute;
    bottom: 0;
    width: 100%;
    background: white;
    box-shadow: 0 -2px 10px var(--shadow-color);
  }
  
  /* Button Styling */
  .btn-sesion {
    background-color: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    border: none;
    transition: all var(--transition-speed) ease;
    box-shadow: 0 2px 4px var(--shadow-color);
  }
  
  .btn-sesion:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 6px var(--shadow-color);
  }
  
  .btn-sesion:active:focus {
    transform: translateY(1px);
    box-shadow: 0 1px 2px var(--shadow-color);
  }
  
  /* Carousel */
  #myCarousel,
  .carousel-inner {
    position: relative;
    height: 45vh;
    width: 100%;
  }
  
  .carousel-inner img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
  
  /* Responsive Adjustments */
  @media (max-width: 768px) {
    .navbar-brand img {
      width: 40%;
    }
    
    #myCarousel,
    .carousel-inner {
      height: 30vh;
    }
  }